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CPP QUESTIONS

Printing char by integer qualifier
Printing char by integer qualifier
I hope this helps . A characters that begins with \0 represents Octal number, is the base-8 number system, and uses the digits 0 to 7. So \08 is invalid representation of octal number because 8 ∉ [0, 7], hence you're getting implementation-defined be
TAG : cpp
Date : November 25 2020, 07:22 PM , By : Kagiri
How to write code to be executed before main() gets control?
How to write code to be executed before main() gets control?
hop of those help? Initial answer You could use a constructor of an object at namespace scope.
TAG : cpp
Date : November 25 2020, 07:22 PM , By : sabitha
Blocking socket - waitForReadyRead()
Blocking socket - waitForReadyRead()
this one helps. Currently in my QT code I have something like this: , You can use -1 as the parameter to wait indefinately.
TAG : cpp
Date : November 25 2020, 07:22 PM , By : Leitel
std::string related errors and handling them, c++
std::string related errors and handling them, c++
it helps some times You don't need to list every error case for the whole class; just look up the documentation for the functions that you use, which typically lists preconditions.For example, cppreference.com's page on std::string::erase.
TAG : cpp
Date : November 25 2020, 07:22 PM , By : Madhukar Kumar
VM interpreter - weighting performance benefits and drawbacks of larger instruction set / dispatch loop
VM interpreter - weighting performance benefits and drawbacks of larger instruction set / dispatch loop
will help you You might want to consider separating the VM ISA and its implementation. For instance, in a VM I wrote I had a "load value direct" instruction. The next value in the instruction stream wasn't decoded as an instruction, but loaded as a v
TAG : cpp
Date : November 25 2020, 07:22 PM , By : Melamori
C / C++ SHIFT / OFFSET / MOVE a Bitmap to the LEFT or RIGHT?
C / C++ SHIFT / OFFSET / MOVE a Bitmap to the LEFT or RIGHT?
should help you out You didn't explain your goal very well, but I presume you want the "wrap-around" to be on a per-line basis. So, the n pixels at the left of each line should end up flowing to the right of the line instead.Just shifting the bytes a
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Pix Games
Printing numbers column by column
Printing numbers column by column
This might help you You have a few choices: Write each sim result to a separate file and collate later; Hold all results in memory until finished; After each simulation, read the existing file, and output it again with the new results added in; Knowi
TAG : cpp
Date : November 25 2020, 07:06 PM , By : user4640301
How do you change your app icon in visual studio 2013?
How do you change your app icon in visual studio 2013?
may help you . I'm new to visual studios and I just created this very short calculator and I want to put it on mediafire for people to download but I wanted to change the icon.. , Create a text file, rename it res.rc, edit it to contain the line:
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Marco Tabor
Fast Screen Transfer
Fast Screen Transfer
With these it helps What is the fastest way in C++ to share screens between computers, like in Skype or Google Plus? Currently I'm taking a screenshot, convert it to low-quality JPG with GDI+ and then send it too a remote computer, but although it wo
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Pritam V Kirdat
c++ Read text file and input the numbers into a 2D array
c++ Read text file and input the numbers into a 2D array
it should still fix some issue C++ supports vectors which basically resize as needed and so allow you to have an "array" of arbitrary size. You would use getline to get read each line and create the vector. You can open the file by using an ifstream:
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Radhouene Jouini
Why are my C++ pointers suddenly diverging?
Why are my C++ pointers suddenly diverging?
Any of those help You should call RRotate(root) if you want node to be a pointer to this->root.Or, more detailed:
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Franc Sutherland
Is there a macro-based adapter to make a functor from a class?
Is there a macro-based adapter to make a functor from a class?
hope this fix your issue How about relying on aggregate initialization? Simply do not declare the constructor:
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Super
CRTP and multilevel inheritance
CRTP and multilevel inheritance
This might help you A friend of mine asked me "how to use CRTP to replace polymorphism in a multilevel inheritance". More precisely, in a situation like this: , (1) The topmost class in the hierarchy looks like:
TAG : cpp
Date : November 25 2020, 07:06 PM , By : user4640083
How to implement timer for each object in c++?
How to implement timer for each object in c++?
will help you Back in 2004 I started writing a series of blog posts called "Practical Testing" which demonstrated how to test a C++ timer implementation. The series consists of many versions of a fully functional light-weight timer queue which uses a
TAG : cpp
Date : November 25 2020, 07:06 PM , By : Gia Anugrah Novembri
Stuck when testing custom list class in c++
Stuck when testing custom list class in c++
will help you When appending an element, if resizing is necessary, you forget to actually append the said number:
TAG : cpp
Date : November 25 2020, 01:01 AM , By : Abhinav Chaudhary
Using each member of class within one function to calculate average
Using each member of class within one function to calculate average
it helps some times I have a class with 4 test scores. Test1 - Test4. I want to create a function called mean that will compute the average of each exam in the course and store it in the mean array. But i can't seem to accomplish this through a singl
TAG : cpp
Date : November 25 2020, 01:01 AM , By : xibir
check whether if two squares are intersecting with each other
check whether if two squares are intersecting with each other
it should still fix some issue You don't have to loop through all coordinates to check if two squares intersect.Here's a simple solution which will work as long as the squares are not rotated.
TAG : cpp
Date : November 25 2020, 01:01 AM , By : nicolasfo
Glm Quaternion lookat function
Glm Quaternion lookat function
To fix this issue Since version 0.9.9.0 there is a function in doing mostly what you want:
TAG : cpp
Date : November 25 2020, 01:01 AM , By : kamran raza
Is there guarantee heap allocated block address will not change(implicitly)?
Is there guarantee heap allocated block address will not change(implicitly)?
I hope this helps you . Yes, otherwise pointers would be useless, and you would need a lock/unlock mechanic to use them (like in C where there is the fixed keyword that makes an object unmoveable)
TAG : cpp
Date : November 25 2020, 01:01 AM , By : TzGuru
Cosine Calculation without cmath library
Cosine Calculation without cmath library
it helps some times You have sin(x) working? Then it's easy. cos(x) = sin(x + pi/2)
TAG : cpp
Date : November 25 2020, 01:01 AM , By : krontill
Manually deleting a pointer returned by function
Manually deleting a pointer returned by function
it fixes the issue Short answer: You are right that you shouldn't delete, but that's the least of your worries…You are returning the address of a local variable (i). That's bad karma.
TAG : cpp
Date : November 25 2020, 01:01 AM , By : James
Avoid output interleaving
Avoid output interleaving
this one helps. I think the best way to go about this would be to have a message queue. You make sure only one thread can write to the queue at a time by using a mutex, and you have another thread reading from the queue and actually doing the output.
TAG : cpp
Date : November 25 2020, 01:01 AM , By : Sami Gerdt
C++ error : Expected an identifier
C++ error : Expected an identifier
hop of those help? i am trying to make an header but it gives me error : , These lines are incorrect
TAG : cpp
Date : November 25 2020, 01:01 AM , By : Oleander
Segmentation fault when I call operator new in linux mint
Segmentation fault when I call operator new in linux mint
it helps some times gdb already gave you a hint where the error is coming from. The only place where you use swap is in this function:
TAG : cpp
Date : November 25 2020, 01:01 AM , By : Amira Ashmawy
Recursively Solving A Sudoku Puzzle Using Backtracking Theoretically
Recursively Solving A Sudoku Puzzle Using Backtracking Theoretically
I hope this helps . Here is a simple pseudocode which may help you understand the recursion and backtracking:
TAG : cpp
Date : November 25 2020, 01:01 AM , By : MrZaKaRiA
lambda closure type and default argument in function template
lambda closure type and default argument in function template
hope this fix your issue Can I suggest a workaround?Remove the default template argument for function3 (and function4):
TAG : cpp
Date : November 25 2020, 01:01 AM , By : Charles
How to ensure the function return consistent floating point values in C/C++?
How to ensure the function return consistent floating point values in C/C++?
this will help Reproducible results are not guaranteed by the language standards. Generally, a C implementation is permitted to evaluate a floating-point expression with greater precision than the nominal type. It may do so in unpredictable ways, suc
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Vũ Nguyễn Đình
What does throw do when not in used with try and catch?
What does throw do when not in used with try and catch?
Hope that helps The C++ runtime will have something along the lines of (this is NOT exactly how it looks, but you can think of it as working this way, unless you are working on something very special):
TAG : cpp
Date : November 24 2020, 03:41 PM , By : mjb75
The Unpredictablilty of the Order of Evaluation of Subexpressions
The Unpredictablilty of the Order of Evaluation of Subexpressions
Hope this helps It's undefined behavior; you could get any results, your program could crash, or send an insulting letter to your boss. Any book which has this as an example, and specifies some specific output for it, should be thrown in the trash; t
TAG : cpp
Date : November 24 2020, 03:41 PM , By : DisplayName=
cannot convert const wchar_t to 'const_char' for argument 2 in MessageBOX etc etc
cannot convert const wchar_t to 'const_char' for argument 2 in MessageBOX etc etc
hope this fix your issue You are building an ANSI build, but using a Unicode literal. Either use regular string literals (drop L prefix in front), or switch to a Unicode build.
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Rodrigo Robles
Size of a empty Class & Derived Virtual Class
Size of a empty Class & Derived Virtual Class
this will help Note that sizeof(any_class) is implementation-defined. But what actually happens in your case. Well, it is using virtual inheritance, most implementations use a hidden pointer to implement this feature which cost sizeof(pointer) bytes
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Stacey Mccullough
unformatted i/o to and from memory
unformatted i/o to and from memory
help you fix your problem You can't use the > operators to write/read unformatted data (they are dealing only with textual input and output), but you can use the write method of output streams and the read method of input streams.And as std::string a
TAG : cpp
Date : November 24 2020, 03:41 PM , By : 49err
Storing an std::thread object as a class member
Storing an std::thread object as a class member
I think the issue was by ths following , I'm trying to keep an std::thread object inside a class. , On this line:
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Lawrence Trevor
Remove duplicate string in an array
Remove duplicate string in an array
this will help If the order doesn't matter, you can first sort the array with std::sort, then use std::unique to remove the duplicates.
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Jasonizer81
How to use copy_if() polymorphically?
How to use copy_if() polymorphically?
I hope this helps you . You might want to define a function transform_if (which is missing in the standard):
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Pacman
How to organize a class's member functions?
How to organize a class's member functions?
seems to work fine It's hard to judge, it's up to your personal preference or company coding standard. By looking at your code, a few things I may not agree: your declarations are not ordered from pubilc,'protected` then private friend declaration ha
TAG : cpp
Date : November 24 2020, 03:41 PM , By : Taufik
How to wrap std::chrono in a c++ iterator type
How to wrap std::chrono in a c++ iterator type
wish of those help Range-based for loops (for ( range_declaration : range_expression ) loop_statement) are syntactic sugar for (in your case) this:
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Sean Peng
Check if a socket is connected in mac os x
Check if a socket is connected in mac os x
This might help you In Windows platform I can check if a socket is connected by this code: , This function works for both Windows and Mac platforms:
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Sutton Cheng
Grabbing the mouse cursor in GLFW
Grabbing the mouse cursor in GLFW
I wish did fix the issue. If you want the system cursor to be visible and restricted to the window then no, that is not currently possible. However, if you want the system cursor to be grabbed and hidden, for example if you wish to draw your own curs
TAG : cpp
Date : November 24 2020, 05:47 AM , By : ungermkmu
Calling Windows shell menu (same as right-click in Explorer) for multiple files programmatically
Calling Windows shell menu (same as right-click in Explorer) for multiple files programmatically
Any of those help I'm trying to display a shell context menu for a file (same as when I right-click that file in Explorer) programmatically. I've managed to do that for a single file / folder, my code is below. Now, how can I call a context menu for
TAG : cpp
Date : November 24 2020, 05:47 AM , By : david allen
Pop up dialog to save file in seperate thread
Pop up dialog to save file in seperate thread
around this issue In addition to comments regarding design and reading file names from GUI thread before creating the other one and passing handles as arguments, I understand that may be some scenarios where you need to invoke GUI dialogs from other
TAG : cpp
Date : November 24 2020, 05:47 AM , By : donz
Why would you use the keyword const if you already know variable should be constant?
Why would you use the keyword const if you already know variable should be constant?
help you fix your problem Apart from specifying to readers of the code that you may cause errors if you modify this variable(you can use comments to do this)
TAG : cpp
Date : November 24 2020, 05:47 AM , By : jherwig1
Detecting Small Sound Effects In C++
Detecting Small Sound Effects In C++
Hope that helps If the problem is to determine which of a pre-defined set of sounds has been recorded then I can think of two options: "compare" the recording to all of the sounds in your database, or perform a "lookup" based on general characteristi
TAG : cpp
Date : November 24 2020, 05:47 AM , By : mugabuga
How to avoid the copy when I return
How to avoid the copy when I return
like below fixes the issue Modem C++ compiler will implement: given a type T: If T has an accessible copy or move constructor, the compiler may choose to elide the copy. This is the so-called (named) return value optimization (RVO), which was specifi
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Stephen Craimer
Getting error code C2228: left of '._Ptr' must have class/struct/union
Getting error code C2228: left of '._Ptr' must have class/struct/union
it fixes the issue is_directory() returns a bool, not a Path, which is what file_size() takes as an argument.The error you get probably means that file_size() is a macro, which means that this:
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Jike Li
In win32 C++ programming how can I duplicate a window style?
In win32 C++ programming how can I duplicate a window style?
This might help you GetWindowInfo should retrieve what you need from the original window. It returns a WINDOWINFO structure with the following:
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Austin Hollingshead
Should the order of import statements matter when importing a .so?
Should the order of import statements matter when importing a .so?
wish help you to fix your issue The order of import statements matter.As documented in the python language reference:
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Harry Ives
Design decision regarding std::array fill
Design decision regarding std::array fill
To fix the issue you can do std::array in C++11 is a useful class that provides a C++ Container interface over a C stack array. , From section 23.3.2.1:
TAG : cpp
Date : November 24 2020, 05:47 AM , By : David Espinoza
Access array of C++ structs from Fortran?
Access array of C++ structs from Fortran?
I hope this helps . You could:1) pass the C++ array to a Fortran BIND(C) procedure that takes an appropriate array argument.
TAG : cpp
Date : November 24 2020, 05:47 AM , By : Lilia K
Determining when functions allocate memory in C++
Determining when functions allocate memory in C++
like below fixes the issue Read the documentation of all libraries you use. They should tell you if certain things should be freed.
TAG : cpp
Date : November 24 2020, 05:47 AM , By : barath kumar
C++ using std::set remove duplicate item for a struct fail.
C++ using std::set remove duplicate item for a struct fail.
wish help you to fix your issue std::set detects duplicates by means of the trichotomy law, which states that if !cmp(a, b) !cmp(b, a) then eq(a, b), for some order relation cmp and some equivalence relation eq. If you want eq to stand for equal, yo
TAG : cpp
Date : November 24 2020, 05:44 AM , By : Thomas Vaughan
Code to find out the number of triplets which lead to a sum less than or equal to threshold is giving a wrong output
Code to find out the number of triplets which lead to a sum less than or equal to threshold is giving a wrong output
I wish did fix the issue. Every element of nums is greater equal zero.Therfor a = nums[i] is greater equal zero.
TAG : cpp
Date : November 24 2020, 05:44 AM , By : John
Converting glm::lookat matrix to quaternion and back
Converting glm::lookat matrix to quaternion and back
hop of those help? Solution:You have to invert the rotation of the quaternion by conjugating it:
TAG : cpp
Date : November 24 2020, 05:44 AM , By : Alejandro Fadil
Searching multi-dimensional vectors
Searching multi-dimensional vectors
With these it helps I had an image process problem a couple of years ago (was using douglas peucker algorithm) and I had severe performance issues. It ran forever. Then I changed to use a spatial index library and then it ran in no time. I can check
TAG : cpp
Date : November 24 2020, 05:44 AM , By : Eric Lee
Send and receive via SOCKS5 c++
Send and receive via SOCKS5 c++
hop of those help? Once you have successfully authenticated with the proxy and told it where to connect to, then you simply send/recv your desired data (in this case, the HTTP data) using the existing connection to the proxy, as if you had connected
TAG : cpp
Date : November 24 2020, 05:44 AM , By : Qiming Shan
GDI+: unhandled exception when drawing bitmap
GDI+: unhandled exception when drawing bitmap
around this issue There are several things wrong here: Jpeg files are complex files containing compressed data. You are reading the entire file in, and treating it as if it was a basic bitmap. That simply can not possibly work (it's similar to puttin
TAG : cpp
Date : November 24 2020, 05:44 AM , By : sidxz
Editing other processes memory
Editing other processes memory
should help you out Because they are read-only memory, I expect. You'll need to use VirtualProtect to remap it as writeable.
TAG : cpp
Date : November 24 2020, 05:44 AM , By : Cinthea Hernandez
Object deleted when its member function is being executed?
Object deleted when its member function is being executed?
I hope this helps you . It is probably undefined behavior, unless you are extra careful.Deleting the object while your thread accesses it in an unordered (non-synchronized, basically) manner is undefined behavior, even if you get lucky.
TAG : cpp
Date : November 24 2020, 05:44 AM , By : Cameron Booth
Infinite Loop while inputting the different data type values in STACK
Infinite Loop while inputting the different data type values in STACK
This might help you Once you input the int value for example as 1.1 (invalid int value). Input conversion error occurs and the input stream because of invalid data ignores the rest of the operation even the cin. Make your code more generic in order f
TAG : cpp
Date : November 24 2020, 01:01 AM , By : user2957644
const members and operator=
const members and operator=
should help you out I have a struct with some const variables , You are doing an assignment:
TAG : cpp
Date : November 24 2020, 01:01 AM , By : LMStaples

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